linux-kernel - Re: [sched next] overflowed cpu time for kernel threads in /proc/PID/stat

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Date:	Tue, 20 Aug 2013 17:42:59 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Stanislaw Gruszka <sgruszka@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: [sched next] overflowed cpu time for kernel threads in
 /proc/PID/stat

On Tue, Aug 20, 2013 at 06:35:50PM +0300, Sergey Senozhatsky wrote:
> On (08/20/13 17:15), Frederic Weisbecker wrote:
> > On Tue, Aug 20, 2013 at 02:14:26PM +0300, Sergey Senozhatsky wrote:
> > Hello,
> > 
> > Please upload your config.
> > 
> > I'm adding Stanislaw in Cc in case it relates to cputime scaling.
> >
> 
> please find attached.
> 
> 	-ss

> #
> # CPU/Task time and stats accounting
> #
> CONFIG_VIRT_CPU_ACCOUNTING=y
> CONFIG_VIRT_CPU_ACCOUNTING_GEN=y

So it happens with full dynticks cputime accounting.
How reproducable is this? Does it always happen?
Does it happen with CONFIG_TICK_CPU_ACCOUNTING as well? (you'll
need to deactivate full dynticks.)

Thanks.
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